On doing so, you'll download
a zipped file - i.e. compressed file. You'll have to unzip the file before Navgps can read it.
Each zip file contains four files:
- .map extension - contains all map data except elevation.
- .elv extension - contains elevation data. This file is optional. Delete it if you don't need elevation,
Navgps is too slow with elevation or don't have enough memory.
- .csv extension - this is another optional file and is included if you'd like to improve
the map data. There's no need to copy this file to the pda.
- a readme.txt file